Portion of an illuminating device



FIG. 1 is a front perspective view of a portion of an illuminating device showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof.

The unshaded interior faces of the base form no part of the claimed design. The broken line showing of the interior elements of the base, the seven circles on the exterior face of the base, and the remainder of the illuminating device is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of an illuminating device, as shown and described. 